Hi @troesterIt seems you are the first one using this.
Can you try in components\com_fabrik\router.php
change line 210 to
if (!$menuItem instanceof Joomla\CMS\Menu\MenuItem || !isset($query['view']))
and after line 221 add
if (isset($query['lang'])) unset($query['lang']);
Besides updating code as above in what release should one expect to see this fixed?Now added.